Tense - A set of forms taken by a verb to indicate the time (and sometimes also the continuance or completeness) of the action in relation to the time of the utterance.

 Types of tenses - 1. Present tense 
                           2. Past tense
                           3. Future tense
Present tense -  expressing an action now going on or habitually performed or a condition now existing. Eg. I am going to a Zoo today.

Past tense -  expressing an action that has happened or a state that previously existed.
Eg. I went to a Zoo yesterday.

Future tense - 
a tense of verbs expressing events that have not yet happened. Eg. I will be going to a Zoo tomorrow.
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Tense give the information of time with the help of suitable verb